How much HP can a stock 68RFE handle?

With quality transmission control module (TCM) tuning, the stock 68RFE can support 500rwhp and 1,000 lb-ft or more, but it won't survive boosted, four-wheel drive launches for very long—and maybe not even once if the Low/Reverse sprag explodes (which is common).

How much horsepower can a stock Cummins transmission handle?

Registered. Stock will hold 100000 HP!

Is the 68RFE transmission good?

Overview of the 68RFE:

Despite all of the impending doom the 68RFE and it's abysmal valve body bring forth, it is a powerfully reliable transmission after being properly built. But, in stock form, it cannot hold much more than factory power.

How much line pressure can a stock 68RFE handle?

Line pressure is limited in a stock 68RFE to 170 PSI. Unfortunately, this is not high enough to reliably prevent clutch slippage above 400hp.

What is the strongest Cummins Engine?

The new 4000 hp QSK95 is the highest horsepower diesel engine ever developed by Cummins. With an output of 4000 hp and more, Cummins' new QSK95 is the world's most powerful high-speed diesel engine.

650HP on a Stock 68RFE?

How do I put more power in my 6.7 Cummins?

Tunes primarily improve power by increasing turbo boost levels. When running higher boost levels bringing more air into the engine is necessary to reduce stress on the turbo and improve its ability to spool quickly. Therefore, we recommend going with a performance intake system to increase airflow into the engine.

How much line pressure should a 6.7 Cummins have?

170 psi. The more the better, but that's all you can get with the stocker. The torque of our Cummins puts a lot of stress on a transmission, so the more pressure you can apply to hold the clutches the longer they will last.

How does a 68RFE work?

The 68RFE pressure control sys- tem monitors input torque and adjusts the pressure accordingly. The primary stage of the pump works continuously; the second stage is bypassed when demand is low.

Why does the 68RFE fail?

Because of their lack of mass, the 68RFE clutches have a very low tolerance to heat and do not dissipate it well. Once these clutches heat up past a certain temperature, they begin to distort. This decreases the overall clearance and causes the clutches not to release fully, eventually burning up (Figure 1).

How many miles does a 68RFE last?

Some lucky and gentle drivers can get 75k plus on a MILDLY tuned 68rfe w\ trans tuning. We have customers call us all the time with 150k plus miles on STOCK trucks and they are still on their original transmission.

Which is better 68RFE or Aisin?

While the Aisin's overall ratio spread is 3.75-0.63, the 68RFE's is only 3.23-. 0.63. The difference is the Aisin has a much deeper First (3.75:1) and Second (2.0:1) to maximize the 6.7L's torque delivery for more low-end pulling power.

How much power can a stock 47RE handle?

A stock 47RE will only safely handle 100psi of fluid pressure, while a Racing Valve body from Power Driven Diesel can handle 225 to 250psi, and thus more than 1,200 horsepower output.

How much HP can a stock 5.9 Cummins handle?

The 5.9L inline-six mill's factory rotating assembly from '89 to '02 is capable of handling 800 hp (1,400 to 1,600 lb-ft of torque) without breaking a sweat, and is often pushed into four-digit territory before aftermarket rods become a consideration.

How much boost does a stock 6.7 Cummins have?

Under full throttle the Ford 6.7 would make about 30psi of boost. My RAM 6.7 seems to only be able to make about 15psi? That's all I have ever seen on the gauge under wide open throttle. It pulls a lot less hard on hills than the Ford.

Does Ford own Cummins?

It's a common myth that Cummins is owned by auto manufacturers like Ford or Chrysler. In fact, Cummins Turbo Technologies is an independent company that manufactures and markets a complete line of diesel and natural gas-powered engines.

What makes a Cummins High Output?

The standard output Cummins provides peak torque at 1,700 rpm, while the High Output version will do so at 1,356 rpm. High Output engines benefit from a heavy-duty Aisin six-speed automatic with a 3.75 first gear, whereas the standard Cummins uses an FCA-built six-speed auto box (68RFE) with a 3.23 first gear.

What does 68RFE stand for?

The 68RFE. The 68RFE transmission is the big brother to the 45/545RFE transmission. The RFE platform was originally designed by Chrysler and was introduced in 1999 with the debut of the new Jeep Grand Cherokee. "RFE" stands for Rear-wheel drive Fully Electronic control.

How can you tell the difference between a 68RFE and Aisin transmission?

All you have to do is open up the hood: If your yellow dipstick handle is on the right side of your engine (the driver's side), you're likely looking at a vehicle with an Aisin transmission. If your dipstick is just to the left of your engine, you're most likely dealing with the 68RFE.

Can you tune a diesel without deleting it?

Registered. Simple answer yes, but your powertrain warranty is for the most part toast once you load a tune. Considering a vast majority of issues with these trucks are related to the emissions components just be prepared to shell out for repairs if needed.

What fuel mileage does a 6.7 Cummins get?

The 2022 RAM 2500 comes equipped with a 6.7-liter Cummins® Turbo Diesel Inline-6 and 6.4-liter HEMI® V8 engine that produces up to 410 hp and 429 lb. -ft. of torque in 4×4 configuration. The engine is rated to do up to 12 city/18 highway/15 combined MPG on the fuel economy when running in the four-wheel drive mode.

How can I get better gas mileage out of my 6.7 Cummins?